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Scientists have reported encouraging results from a small clinical trial of WRSs2, an experimental oral vaccine designed to prevent shigellosis, a potentially serious bacterial infection that causes diarrhea, fever, nausea, and abdominal cramps. Among adults who received two doses, only 3 of 34 developed shigellosis after exposure to live Shigella bacteria, compared with 21 of 26 people who received a placebo. Severe symptoms were also much less common among vaccinated participants. The vaccine uses a weakened strain of Shigella sonnei and could help address the growing threat of antibiotic-resistant infections. Larger trials are still needed before approval and broader use.

A new American Heart Association review suggests that moderate caffeine intake may be safer for the heart than many people think. For most adults, consuming up to 400 milligrams of caffeine daily, roughly equivalent to three to five cups of regular black coffee, is generally considered safe and may be associated with lower risks of heart disease, stroke, heart failure, and type 2 diabetes. However, the source of caffeine matters. Highly concentrated energy drinks and energy shots can deliver much larger doses, potentially raising blood pressure and triggering irregular heart rhythms. Experts emphasize that individual responses to caffeine vary based on health, genetics, medications, and metabolism.

Researchers at the Frazer Institute have uncovered how the gene GFI1 helps control two important branches of the immune system. The gene acts as a key regulator for natural killer cells, which provide rapid defense against infections and tumors, and memory T cells, which create long-lasting protection after exposure to a pathogen. When GFI1 was removed in experiments, natural killer cells failed to mature properly and lost their ability to fight viral infections and cancer effectively. By mapping how this genetic switch controls immune cells, scientists hope to develop more precise therapies that strengthen immune memory, improve vaccines, and enhance the body's ability to fight chronic infections and cancer.

Scientists have discovered four distinct populations of specialized support cells that help maintain the intestine, one of the body's fastest-renewing tissues. The intestinal lining completely rebuilds itself every few days, but researchers previously had limited understanding of how this process is coordinated. Using single-cell RNA sequencing and advanced imaging, the team found that Foxl1-lineage mesenchymal cells form a specialized network beneath the intestinal lining. Each cell population occupies a different location and produces unique signals that influence stem cells, tissue renewal, immune responses, and intestinal structure. The discovery could eventually help guide new approaches to treating intestinal injuries and inflammatory bowel disease.

A Yale study has shed new light on how the brain creates awareness of our own actions, resolving a debate that began more than 130 years ago. Researchers found that awareness depends on multiple brain signals, including activity involved in planning movement and processing sensory feedback after an action. Neither signal worked alone, suggesting that both conscious intention and sensory perception contribute to our awareness of what we do. The study also found that reduced alertness, reflected by shrinking pupil size, was linked to declining awareness. Researchers suggest that being unaware of some actions may be a normal and useful feature that helps everyday activities run smoothly.

The largest genetic analysis of borderline personality disorder (BPD) to date has identified 11 genomic regions and nine genes potentially linked to the condition. Researchers analyzed genetic data from around 13,000 people with BPD and more than 1.1 million controls across 14 countries. The findings suggest that BPD has a complex, polygenic basis, with genetic risk factors overlapping with conditions including PTSD, depression, ADHD, suicidal behavior, COPD, and diabetes. Scientists estimate that the genetic factors studied explain about 17.3% of susceptibility to BPD. The research could improve understanding of the disorder's biology and guide future treatment strategies.

Researchers at KAIST have discovered that B cells and antibodies may play a crucial role in making immunotherapy more effective against aggressive brain tumors such as glioblastoma. The study found that anti-CTLA-4 treatment activates B-cell responses in lymph nodes that drain the brain, rather than relying only on T cells within the tumor. These B cells produce IgG antibodies that attach to glioma cells and help macrophages destroy them. In mouse models, removing B cells largely eliminated the treatment's benefits. The findings challenge the traditional T-cell-focused view of cancer immunotherapy and could guide new strategies for treating difficult-to-treat brain tumors.

New research suggests that parts of the ultra-processed food (UPF) industry use different strategies to challenge concerns about the health effects of these products. Researchers analyzing industry submissions found arguments that processing and additives are safe, nutrient content matters more than processing, and certain products should be separated from “unhealthy” UPFs. Some companies specifically framed their own products - such as plant-based alternatives, cereals, or fortified beverages, as healthier than other processed foods. Researchers describe this as a “my UPF is healthier than yours” strategy, which may shift attention away from broader concerns about ultra-processing and delay stronger public health action.

An international group of researchers is proposing a new approach to healthy aging that begins before a person is even born. The proposed PROSPER consortium would study how parental health, nutrition, sleep, early-life experiences, metabolism, and the gut microbiome may influence long-term health and resilience. Scientists argue that these early factors can leave lasting biological effects, potentially shaping how the body ages later in life. The initiative would bring together health data, biobanks, and international research to identify ways to improve lifelong health. Rather than waiting until middle age to address aging, researchers suggest building resilience from the earliest stages of life.

Researchers at the University of Minnesota Medical School have identified why pancreatic cancer can evade the immune system and spread more easily. The study found that some cancer cells shut down a process that normally makes them visible to immune cells. Researchers also discovered that regulatory T cells can prevent helpful CD4 T cells from attacking these hidden cancer cells. By combining a treatment that restores cancer-cell visibility with immunotherapy designed to activate CD4 helper T cells, scientists improved immune responses and reduced cancer spread in preclinical models. The findings highlight the important role of CD4 T cells and could help guide future pancreatic cancer immunotherapies.